Enhancing biogas quality: An experimental investigation of CO2 and H2S removal techniques
Paper Details
Enhancing biogas quality: An experimental investigation of CO2 and H2S removal techniques
Abstract
The increasing demand for sustainable energy sources has brought biogas into focus as a promising alternative to fossil fuels. However, impurities like carbon dioxide (CO2) and hydrogen sulfide (H2S) in biogas pose challenges to its effective utilization. This study aimed to design a purification system to decrease these impurities, evaluating the efficacy of conventional methods (iron sponge and water scrubbing) and alternative approaches (activated carbon and NaOH solution) in removing CO2 and H2S from biogas. The experimental setup involved integrating the purification system with an anaerobic digester producing raw biogas from swine manure. The concentrations of CH4, CO2, and H2S were measured before and after passing through the purification chambers. Although no H2S was detected in the raw biogas, the study focused on CO2 removal. Results showed that the activated carbon scrubber significantly reduced CO2 levels from 35% to 20% after a 60-minute retention time. The NaOH solution demonstrated excellent CO2 removal efficiency of 86.27%, while the water scrubber achieved only 8.98% efficiency. Both the iron sponge and water scrubber modestly increased the CH4 concentration by 1.9% and 1.7%, after 15 minutes. However, the NaOH solution yielded a more substantial 6.6% increase in CH4 concentration. This study highlights the potential of alternative methods like activated carbon and NaOH solution for effective biogas purification, particularly in removing CO2 impurities and enriching the methane content, promoting sustainable energy solutions.
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Dianne Mae M. Asiñero, Antonio-Abdu Sami M. Magomnang (2024), Enhancing biogas quality: An experimental investigation of CO2 and H2S removal techniques; IJB, V24, N6, June, P114-122
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